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use IEEE.STD_LOGIC_1164.ALL;
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use IEEE.STD_LOGIC_1164.ALL;
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use ieee.std_logic_arith.all;
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use ieee.std_logic_arith.all;
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use IEEE.NUMERIC_STD.ALL;
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use IEEE.NUMERIC_STD.ALL;
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use ieee.std_logic_unsigned.all;
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use ieee.std_logic_unsigned.all;
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--if WriteEnable(0) = '1' then
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-- di0 <= DataIn(7 downto 0);
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-- else
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--di0 := RAM(conv_integer(Address))(7 downto 0);
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-- di0 <= do(7 downto 0);
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--end if;
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--if WriteEnable(1) = '1' then
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-- di1 <= DataIn(15 downto 8);
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--else
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--di1 <= RAM(conv_integer(Address))(15 downto 8);
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-- di1 <= do(15 downto 8);
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--end if;
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entity blockram is
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entity blockram is
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port(
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port(
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Address: in std_logic_vector(7 downto 0); --memory address
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Address: in std_logic_vector(7 downto 0); --memory address
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WriteEnable: in std_logic_vector(1 downto 0); --write 1 byte at a time option
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WriteEnable: in std_logic_vector(1 downto 0); --write 1 byte at a time option
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Enable: in std_logic;
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Enable: in std_logic;
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DataOut: out std_logic_vector(15 downto 0)
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DataOut: out std_logic_vector(15 downto 0)
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);
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);
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end blockram;
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end blockram;
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architecture Behavioral of blockram is
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architecture Behavioral of blockram is
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type ram_type is array (255 downto 0) of std_logic_vector (15 downto 0);
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type ram_type is array (255 downto 0) of std_logic_vector (7 downto 0);
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signal RAM: ram_type;
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signal RAM0: ram_type; --Spartan 3Es don't natively support byte-wide write enables, so we'll just emulate it with 2 banks of RAM
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signal RAM1: ram_type;
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signal di0, di1: std_logic_vector(7 downto 0);
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signal di0, di1: std_logic_vector(7 downto 0);
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signal do : std_logic_vector(15 downto 0);
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signal do : std_logic_vector(15 downto 0);
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begin
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begin
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di0 <= DataIn(7 downto 0) when WriteEnable(0)='1' else do(7 downto 0);
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di0 <= DataIn(7 downto 0) when WriteEnable(0)='1' else do(7 downto 0);
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di1 <= DataIn(15 downto 8) when WriteEnable(1)='1' else do(15 downto 8);
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di1 <= DataIn(15 downto 8) when WriteEnable(1)='1' else do(15 downto 8);
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process (Clock)
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process (Clock)
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begin
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begin
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if rising_edge(Clock) then
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if rising_edge(Clock) then
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if Enable = '1' then
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if Enable = '1' then
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if WriteEnable(0)='1' or WriteEnable(1)='1' then
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if WriteEnable(0)='1' then
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RAM(conv_integer(Address)) <= di1 & di0;
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RAM0(conv_integer(Address)) <= di0;
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else
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do(7 downto 0) <= RAM0(conv_integer(Address)) ;
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end if;
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if WriteEnable(1)='1' then
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RAM1(conv_integer(Address)) <= di1;
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else
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else
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do <= RAM(conv_integer(Address)) ;
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do(15 downto 8) <= RAM1(conv_integer(Address));
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end if;
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end if;
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end if;
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end if;
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end if;
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end if;
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end process;
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end process;
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DataOut <= do;
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DataOut <= do;
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